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Q.

Let f(x) be a polynomial of degree 3 such that f(3)=1,f'(3)=1,f''(3)=0,f'''(3)=12. Then the value of f'(1) is

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a

–21

b

23

c

–13

d

12

answer is C.

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Detailed Solution

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f(x)=a(x3)3+b(x3)2+c(x3)+d

f(3)=d=1

f′′(x)=6a(x3)+2b

f1(3)=3a(x3)2+2b(x3)+cf1(3)=1=c

f''(3)=02b=0b=0f'''(x)=6a

f'''(3)=6a=12a=2

f(x)=a(x3)3+b(x3)2+c(x3)+d=2(x3)3+(1)(x3)+1

f(x)=6(x3)21

f(1)=6(13)21=6(4)1=23

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